User`s manual

Western Reserve Controls, Inc. 1782-JDC User’s Manual

1. Overview

The 1782-JDC is a family of DeviceNet-to-serial link communications gateways that provide a

flexible DeviceNet interface to a wide variety of ASCII devices. The JDC allows the user to easily

and conveniently connect and integrate a peripheral products with either RS232 or RS485 serial

ports into a DeviceNet system.

Using the JDC you may communicate with the connected peripheral devices in the same fashion

as the other DeviceNet products in the system. Data may be read/written using either I/O polling

or explicit messaging. Typically real-time data is read and written as I/O by the DeviceNet Master

via Polled I/O and parameters are read and written with the Explicit Messaging technique.

The 1782-JDC is defined as a Communications Adapter device on the DeviceNet system. It has a

3-pin plug connector for connection to a RS232 or RS485 interface port on your device and a 5-

pin pluggable DeviceNet connector for connections to the DeviceNet network. Baud rate selection

is done automatically by the device when it is powered up on a network. The 1782-JDC has one

assigned DeviceNet address which is set by a 6-position DIP switch on the unit. Other JDC

parameters are software-configurable and are changed from their default values by third-party

DeviceNet configuration tools. Each 1782-JDC has 2 standard green/red DeviceNet LED’s for

module status and network status and two green LED’s to indicate RS485 transmit and receive

activity.

The RS232 version may be used for point-to-point connection to a single serial device. The

RS485 version may be connected in a point-to-point fashion to single device, or to multiple

devices in the standard RS485 convention.

The JDC is a general purpose gateway that is completely device-independent. The JDC does not

interpret the data being transmitted across it, and so the transferred messages may contain data

of any nature or definition. This allows you to use the same device for a wide variety of DeviceNet-

serial interface applications.

Figure 1-1 1782-JDC